Why isn't my serial number working?

The serial is for an older version of the product you're trying to installIf a serial for an older version of a product is used on an installer that's trying to install an upgraded version, it will not work (ex. Trapcode Suite 13 serial in a Trapcode Suite 14 installer, PluralEyes 3.5 used in a PluralEyes 4 installer)

If you're not certain which product and/or version your serial is for, see this guide.

The four-letter prefix is missingAll of our serials are a twenty-character string prefixed with four letters. You'll want to make sure the four letter prefix is included when entering it into the installer.

You are not an administratorInstallers will place a serial file that's accessible by all users on a system, which can only be done by an administrator.Is is not enough to install as a non-administrative user and provide administrative credentials when prompted; a user has to be an administrator upon launching the installer.

There are multiple installers openHaving multiple installers open can cause problems as they may interfere with each other. Close any and all installers you've got open and only have one open at a time.

(Mac only) There are permission issues on the directory the serial is trying to get placed inOn Mac OS X systems, there can sometimes be file permission issues with where the serial file is trying to be placed.To fix this, follow these steps:

Close all programs (namely the installer and any programs you're trying to install into)

Open a Finder window and select Go > Go to Folder... from the top menu bar

Type or copy & paste this file path in: /users/shared/

Select the Red Giant folder and click File > Get Info

Reveal the Sharing & Permissions area toward the bottom of the window that comes up toward the bottom if it isn't already, then click the Padlock in the lower right (entering your credentials when prompted)